Segment Information (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Identifiable Assets	$ 1,222,576	$ 1,199,508
Rentals [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	456,309	379,453
Well Services [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	605,804	636,256
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	$ 160,463	$ 183,799